CN110954278A - Leak detection method - Google Patents
Leak detection method Download PDFInfo
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- CN110954278A CN110954278A CN201911214894.3A CN201911214894A CN110954278A CN 110954278 A CN110954278 A CN 110954278A CN 201911214894 A CN201911214894 A CN 201911214894A CN 110954278 A CN110954278 A CN 110954278A
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- leak detection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/202—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material using mass spectrometer detection systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/202—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material using mass spectrometer detection systems
- G01M3/205—Accessories or associated equipment; Pump constructions
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- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention provides a leak detection method, which comprises the following steps: step S1: filling the leak detection gas into the leak detection balloon; step S2: placing the leakage air bag filled with leakage detection gas in a workpiece to be detected, and then sealing the workpiece to be detected; step S3: placing a workpiece to be detected in the leak detection box; step S4: leaking the leak detection gas in the leak air bag; step S5: and detecting the leakage detection gas in the leakage detection box. The leak detection method is simple to operate and high in detection efficiency.
Description
Technical Field
The invention belongs to the technical field of leak detection, and particularly relates to a leak detection method.
Background
In the prior art, along with the development of scientific technology, no matter in the technical field of vacuum or high-pressure air tightness engineering, the air tightness requirement of a part or a system is improved along with the development of the scientific technology, so that the research on improving the air tightness detection precision and influencing the air tightness factor is very urgent. When leak detection is performed on a sealed container, when the quality of a welding seam and the surface of the welding seam are detected to be provided with a tiny leak hole, a workpiece is completely sealed, a positive pressure method and a negative pressure method of a traditional leak detection method cannot be realized, a back pressure method is often adopted to perform leak detection on the sealed container, and the leak detection method is suitable for a detected part with a small volume. The leak detection process comprises 3 steps: pressurizing, purifying and detecting leakage. During the pressurizing process, the detected piece is stored in a container filled with high-pressure helium for a certain time, so that the helium enters the detected piece through the leakage hole, and the inflation pressure and helium partial pressure in the detected piece are gradually increased along with the increase of time; after entering the purification stage, flushing with dry nitrogen and the like, or removing helium adsorbed on the outer surface of the detected piece by a standing means; and finally, placing the detected piece into a vacuum chamber, vacuumizing the vacuum chamber, enabling helium in the detected piece to flow out to enter a leak detector by utilizing the pressure difference effect, and outputting an indication by the leak detector to judge the existence and the leak rate of a leak hole.
However, the back pressure method is not suitable for a test piece having a large leak hole. When the leak hole is too large, helium filled into the detected part can quickly run off in the purification stage, and the longer the purification time is, the more serious the helium runs off, so that the output indication of the leak detector is reduced, the false phenomenon that the leak rate of the leak hole is very small is caused, and even the leak hole cannot be detected.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a leak detection method.
The leak detection method of one embodiment of the invention comprises the following steps:
step S1: filling the leak detection gas into the leak detection balloon;
step S2: placing the leakage air bag filled with leakage detection gas in a workpiece to be detected, and then sealing the workpiece to be detected;
step S3: placing a workpiece to be detected in the leak detection box;
step S4: leaking the leak detection gas in the leak air bag;
step S5: and detecting the leakage detection gas in the leakage detection box.
According to the leak detection method provided by the embodiment of the invention, the leak detection gas is put in before the workpiece to be detected is completely sealed, so that the problem that the leak detection gas cannot be introduced from the outside of the workpiece to be detected in the leak detection of the closed container is solved, the leak detection gas can be discharged at regular time by the timing opening device, the operation is simple, the detection precision is high, and the production efficiency is improved. As long as the detection device detects that the leak detection gas exists in the leak detection box, the leak detection device can indicate that the workpiece to be detected has a leak hole, and the technical problem of detection errors caused by the large leak hole of the workpiece to be detected in the back pressure helium mass spectrum leak detection method is solved.
In a preferred or optional embodiment, in step S3, after the workpiece to be tested is placed, the interior of the leak detection box is evacuated.
In a preferred or alternative embodiment, the leak detection gas is a halogen gas, helium gas, or hydrogen gas.
In a preferred or optional embodiment, in step S5, the concentration of the leak detection gas in the leak detection box is detected in real time, and a real-time concentration variation curve of the leak detection gas in the leak detection box within a preset time period is obtained.
In a preferred or optional embodiment, in step S5, the air pressure of the leak detection box is detected in real time, so as to obtain a real-time air pressure variation curve of the leak detection box within a preset time period.
In a preferred or optional embodiment, in step S4, the air-leaking bag is heated by a heating device, an opening is generated on the surface of the air-leaking bag, and the leak detection gas inside the air-leaking bag leaks out.
In a preferred or alternative embodiment, in step S4, the leak detection gas inside the leak airbag is leaked out by piercing the leak airbag with a piercing device.
In a preferred or alternative embodiment, in step S4, the leakage bladder vents its interior leakage detection gas after a preset period of time.
In a preferred or optional embodiment, in step S4, the leakage air bag is opened by an external force generated by shaking of the workpiece, so that the leakage air inside the leakage air bag leaks out.
In a preferred or optional embodiment, in step S4, the air leakage bag is opened under the change of external pressure, so that the air leakage detection gas inside the air leakage bag leaks out.
In order that the invention may be more clearly understood, specific embodiments thereof will be described hereinafter with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic view of the overall configuration of a leak detection apparatus in embodiment 1 of the invention;
FIG. 2 is a schematic view of the operating principle of leak detection apparatus in accordance with embodiment 1 of the invention;
fig. 3 is a schematic structural diagram of a containing device in embodiment 1 of the present invention;
FIG. 4 is a schematic structural view of a leaking bladder according to embodiment 1 of the present invention;
FIG. 5 is a schematic structural view of a door closing mechanism according to embodiment 1 of the present invention;
FIG. 6 is a schematic view showing the constitution of a holder and an ejector in accordance with embodiment 1 of the present invention;
FIG. 7 is a schematic view of the structure of a push-out apparatus according to embodiment 1 of the present invention.
The drawings illustrate schematically: 1. a support; 2. a housing device; 21. a leak detection box; 211. a feeding port; 22. a closing door; 3. a clamp; 4. an air leakage bag; 5. a heating device; 6. a detection device; 7. a door closing device; 71. a door closing guide rail; 72. a door closing cylinder; 8. a push-out device; 81. pushing out the guide rail; 82. and pushing out the cylinder.
Detailed Description
Example 1
Referring to fig. 1 and 2, fig. 1 is a schematic diagram showing the overall structure of a leak detection apparatus in embodiment 1 of the invention, and fig. 2 is a schematic diagram showing the operating principle of the leak detection apparatus in embodiment 1 of the invention.
The leakage detection device provided by the embodiment comprises a support 1, a containing device 2, a clamp 3, a leakage bag 4, a heating device 5, a detection device 6, a door closing device 7 and a pushing-out device 8. The accommodating device 2 is arranged on the support 1, the clamp 3 is arranged inside the accommodating device 2, the leakage air bag 4 is placed inside a workpiece to be tested when the accommodating device is used, the heating device 5 is used for heating the leakage air bag 4, the detection device 6 is communicated with the inside of the leakage detection box 21, the door closing device 7 is arranged on the support 1 and matched with the accommodating device 2, the push-off device 8 is arranged on the support 1, and the output end of the push-off device 8 is fixedly connected with the clamp 3.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a containing device according to embodiment 1 of the present invention.
The accommodating device 2 comprises a leakage detecting box 21 and a sealing door 22, the leakage detecting box 21 is a hollow box body, the leakage detecting box 21 is provided with a feeding port 211, a workpiece to be detected and the clamp 3 are placed in the leakage detecting box 21 through the feeding port 211, and the sealing door 22 is movably covered on the feeding port 211. In this embodiment, the bracket 1 is provided with a guide rail, the closing door 22 is embedded on the guide rail through a slider, and the closing door 22 can move on the guide rail, so as to control the closing of the material inlet 211, in other embodiments, one side of the closing door 22 is fixed on the bracket 1 through a rotating shaft, the closing door 22 rotates around the rotating shaft, and the closing of the closing door 22 on the material inlet 211 is controlled by controlling the rotating angle of the closing door 22, which may also be other movable closing manners commonly used by those skilled in the art.
Referring to fig. 4, fig. 4 is a schematic structural view of an air leakage bag according to embodiment 1 of the present invention.
Leak gasbag 4 is located the inside of the work piece that awaits measuring, leak gasbag 4 is used for holding leak hunting gas, in this embodiment, leak gasbag 4 is circular hollow sphere, the surface of leaking gasbag 4 is provided with the opening, in other embodiments, leak gasbag 4 can be other capsule body structures that any technical staff in the field commonly used, as long as can hold leak hunting gas and can place in the inside of the work piece that awaits measuring. Preferably, the air leakage bag 4 is a memory metal bag body, and when the temperature of the memory metal bag body reaches the transformation temperature, an opening is formed on the surface of the memory metal bag body. Preferably, the memory metal balloon is made of a nickel-titanium alloy, the nickel-titanium alloy is a shape memory alloy, the shape memory alloy is a special alloy capable of automatically restoring the plastic deformation of the shape memory alloy to the original shape at a certain specific temperature, the memory metal balloon can also be other common memory metals, such as copper-zinc alloy, copper-aluminum-nickel alloy, copper-molybdenum-nickel alloy, copper-gold-zinc alloy and the like, the memory metal balloon does not need to be entirely made of the memory metal, and only the memory metal balloon is used at the position of the memory metal balloon where the opening is formed. The memory metal capsule body is provided with an opening in the original shape, the opening is sealed after gas is filled, then the memory metal capsule body is placed inside a workpiece to be tested, when the memory metal capsule body is heated to the metamorphosis temperature, the memory metal capsule body is restored to the original shape, and the leak detection gas in the memory metal capsule body leaks to the outside of the memory metal capsule body.
The heating device 5 is used for heating the air leakage bag 4, so that the air leakage bag 4 is heated, an opening is formed on the surface of the air leakage bag 4, and the air leakage detection gas in the air leakage bag is leaked. The heating device 5 may be disposed inside the accommodating device 2, or may be disposed outside the accommodating device 2 to heat the entire accommodating device 2, and the heating device 5 may be a heating wire heater, a warm air blower, an electromagnetic heating device 5, or other heating devices 5 commonly used by those skilled in the art.
The detection device 6 is communicated with the inside of the leak detection box 21 and is used for detecting leak detection gas in the accommodating cavity of the leak detection box 21. The leak detection gas is halogen gas, helium gas, hydrogen gas or other detectable media, and correspondingly, the detection device 6 is a halogen gas detector, a helium mass spectrometer leak detector, a hydrogen gas detector or other detection devices.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a door closing mechanism according to embodiment 1 of the present invention.
The door closing device 7 includes a door closing guide rail 71, a slider (not shown) and a door closing cylinder 72, wherein the door closing guide rail 71 is disposed on the bracket 1, a plane of the door closing guide rail 71 is located on the same plane as the material inlet 211 of the leakage detecting box 21, one end of the slider is slidably embedded on the door closing guide rail 71, the other end of the slider is fixedly connected to the closing door 22, the door closing cylinder 72 is fixedly connected to the bracket 1, a piston rod of the door closing cylinder 72 is fixedly connected to the closing door 22, and the door closing cylinder 72 pushes the closing door 22 to move on the door closing guide rail 71. Preferably, the door closing cylinder 72 is located below the leakage detecting box 21, and the door closing cylinder 72 pushes the closing door 22 to open and close the feeding port 211 of the leakage detecting box 21.
Referring to fig. 6 and 7, fig. 6 is a schematic structural view of a clamp and a push-out device according to embodiment 1 of the present invention, and fig. 7 is a schematic structural view of the push-out device according to embodiment 1 of the present invention.
The ejecting device 8 comprises an ejecting guide rail 81 and an ejecting cylinder 82, the ejecting guide rail 81 is arranged at the bottom end of the inside of the leakage detecting box 21, the moving direction of the ejecting guide rail 81 faces the feeding port 211 of the leakage detecting box 21, the bottom end of the clamp 3 is connected with the ejecting guide rail 81 in a sliding manner, in this embodiment, the bottom end of the clamp 3 is provided with a roller, the roller is connected with the ejecting guide rail 81 in a sliding manner, in other embodiments, the bottom end of the clamp 3 can be provided with a sliding block, and the sliding block is connected with the ejecting guide rail 81 in a sliding manner. The push-out cylinder 82 is arranged outside the leak detection box 21, the push-out cylinder 82 is arranged on the support 1, a piston rod of the push-out cylinder 82 is fixedly connected with the clamp 3, the push-out cylinder 82 drives the clamp 3 to move on the push-out guide rail 81, and when the piston rod of the push-out cylinder 82 extends out, the clamp 3 is driven by the inside of the leak detection box 21 to move towards the feeding port 211 of the leak detection box 21.
The leak detection device of this embodiment puts into leak detection gas before the work piece that awaits measuring is sealed completely, can't let in the problem of leak detection gas from the outside of the work piece that awaits measuring when solving the airtight container leak hunting, and leak hunting bag can emit leak detection gas through the heating, easy operation, and the detection precision is high, improves production efficiency. As long as the detection device detects that the leak detection gas exists in the leak detection box, the leak detection device can indicate that the workpiece to be detected has a leak hole, and the technical problem of detection errors caused by the large leak hole of the workpiece to be detected in the back pressure helium mass spectrum leak detection method is solved.
Example 2
The main difference between this embodiment and embodiment 1 is that the material of the air leakage bag 4 is different, and the air leakage bag 4 is made of a material which is fragile by force or decomposed by heat, such as glass, plastic and the like.
When leak gasbag 4 adopts the fragile material of atress, leak gasbag 4 is being put into behind the inside of holding device 2, heating device 5 heats and holds leak hunting gas leak gasbag 4, later the leak hunting gas is heated the inflation, leak hunting gas toward leak the internal surface extrusion of gasbag 4, cause at last leak gasbag 4 splits, leak hunting gas follows leak gasbag 4 reveals.
When leak gasbag 4 adopts the material that is heated and decomposes, leak gasbag 4 is being put into behind the inside of holding device 2, heating device 5 heats and holds leak hunting gas leak gasbag 4, later leak gasbag 4 is heated and decomposes, causes at last leak hunting gasbag 4 splits open, leak hunting gas follows leak gasbag 4 reveals.
The leak detection device of this embodiment, the hourglass gasbag that adopts is disposable material, leak the easy batch production of gasbag, moreover the material cost that leaks the gasbag adoption is not high.
Example 3
This example provides a leak detection method using the leak detection apparatus of example 1 or example 2 described above.
The detection method of the leak detection method comprises the following steps:
step S1: filling the leak detection gas into the leak detection balloon; preferably, the leak detection gas in the leak airbag is halogen gas, helium gas, hydrogen gas or other detectable media;
step S2: placing the leakage air bag filled with leakage detection gas in a workpiece to be detected, and then sealing the workpiece to be detected;
step S3: placing a workpiece to be detected in the leak detection box, preferably, after the workpiece to be detected is placed, vacuumizing the interior of the leak detection box to enable the interior of the leak detection box to reach a target vacuum degree;
step S4: leaking the leak detection gas in the leak air bag;
in this embodiment, in step S4, the air-leaking bag is heated by a heating device, an opening is generated on the surface of the air-leaking bag, and the leak detection gas inside the air-leaking bag leaks. The air leakage bag can be a memory metal bag body, a material which is fragile under stress or a material which is decomposed by heat.
Step S5: through detection device detects the leak hunting gas of the inside of leak hunting case, the inside of the work piece that awaits measuring with the outside of the work piece that awaits measuring is because there is the pressure difference, if the work piece that awaits measuring has the small opening, is located the leak hunting gas of the inside of the work piece that awaits measuring can more rapidly reveal the outside of the work piece that awaits measuring has increased the high efficiency of detection.
Preferably, in step S5, the concentration of the leak detection gas in the leak detection box is detected in real time, so as to obtain a real-time concentration variation curve of the leak detection gas in the leak detection box within a preset time period. And observing the concentration change of the leakage detection box body, wherein the concentration change reflects the tightness of the workpiece to be detected.
More preferably, in step S5, the air pressure of the leak detection box is detected in real time, so as to obtain a real-time air pressure variation curve of the leak detection box within a preset time period. And observing the air pressure change of the leak detection box, wherein the air pressure change reflects the tightness of the workpiece to be detected.
Example 4
This example provides a leak detection method using the leak detection apparatus of example 1 or example 2 described above. The present embodiment is different from embodiment 3 in step S4.
In step S4, the leak detection gas inside the leak airbag is leaked out by piercing the leak airbag by a piercing device. The puncture device is used for puncturing the air leakage bag, so that an opening is formed on the surface of the air leakage bag, and the leakage detection gas in the air leakage bag leaks out. In one embodiment, the puncturing device comprises a magnetic attraction device and a pricking pin device, the magnetic attraction device is arranged outside the workpiece to be tested, the pricking pin device is arranged inside the air leakage bag, and the pricking pin device is located within the magnetic attraction range of the magnetic attraction device. When the air leakage bag needs to be punctured, the magnetic suction device sucks the puncture needle device, the puncture needle device is stressed to move towards the position of the magnetic suction device, and in the moving process of the puncture needle device, the puncture needle device punctures the air leakage bag, so that leakage detection gas in the air leakage bag leaks. Similarly, the magnetic attraction device and the puncture needle device can also be mutually exclusive, the puncture needle device is forced to move to a position far away from the magnetic attraction device, and the puncture needle device punctures the air leakage bag during the movement of the puncture needle device so as to enable the air leakage detection gas in the air leakage bag to leak.
In other embodiments, the puncturing device includes a vibration device and a pricking pin device, the vibration device is used for vibrating the workpiece to be tested, and the pricking pin device can be arranged inside the air leakage bag or outside the air leakage bag. When the air leakage bag needs to be punctured, a workpiece to be tested is vibrated under the action of the vibrating device, the pricking pin device also vibrates, and in the vibrating process, the pricking pin device punctures the surface of the air leakage bag, so that leakage detection gas in the air leakage bag leaks.
Example 5
This example provides a leak detection method using the leak detection apparatus of example 1 or example 2 described above. The present embodiment is different from embodiment 3 in step S4.
In step S4, the leak detection balloon leaks the leak detection gas inside thereof after a preset time period. In one embodiment, the air leakage bag is a timing opening device, the timing opening device comprises a storage unit, a timing unit, an opening unit and a key unit, the storage unit stores time parameters, the timing unit records measurement time, when the measurement time of the timing unit reaches the time parameters of the storage unit, the timing unit sends an action signal to the opening unit, the opening unit enables the inflation cavity to generate opening leakage detection gas, and the key unit sends the time parameters to the storage unit. Before the user uses, the user passes through the button unit sets up time parameter, the memory cell receives and stores time parameter, the timing unit measurement reachs measuring time, the timing unit will measuring time with the time parameter of memory cell is compared, works as when measuring time reachs when the time parameter, several time units send actuating signal to the opening unit, make the leak hunting gas of inflation chamber leaks. The timing unit may be provided with a display screen, and may count down in a count down mode, and the key unit may be a physical key or a virtual key of a touch screen.
Example 6
This example provides a leak detection method using the leak detection apparatus of example 1 or example 2 described above. The present embodiment is different from embodiment 3 in steps S3 and S4.
In the present embodiment, step S3: placing a workpiece to be detected in the leak detection box, and vacuumizing the interior of the leak detection box after the workpiece to be detected is placed so that the interior of the leak detection box reaches a target vacuum degree;
in step S4, the air-leaking bag is opened under the change of external pressure, so that the leak detection gas inside the air-leaking bag leaks out. The workpiece to be detected is under the target vacuum degree, pressure difference is generated between the inside and the outside of the workpiece to be detected, the workpiece to be detected generates certain deformation, the size of the workpiece to be detected is changed, the external pressure on the air leakage bag is changed, the surface of the air leakage bag is opened, and the air leakage detection gas in the air leakage bag leaks.
In other embodiments, step S3: placing a workpiece to be detected in the leak detection box, and inflating the interior of the leak detection box after the workpiece to be detected is placed so that the interior of the leak detection box reaches a target pressure value;
in step S4, the air-leaking bag is opened under the change of external pressure, so that the leak detection gas inside the air-leaking bag leaks out. Under the target pressure value, the workpiece to be detected generates pressure difference inside and outside the workpiece to be detected, the workpiece to be detected generates certain deformation, the size of the workpiece to be detected is changed, the external pressure on the air leakage bag is changed, the surface of the air leakage bag is opened, and the air leakage detection gas in the air leakage bag leaks.
Example 7
This example provides a leak detection method using the leak detection apparatus of example 1 or example 2 described above. The present embodiment is different from embodiment 3 in step S4.
In step S4, the workpiece is shaken by a vibrating device to puncture the air leakage bag, so that the air leakage detection gas inside the air leakage bag leaks out. The vibrating device shakes the workpiece to drive the inside of the workpiece to move the air leakage bag, the air leakage bag collides with the inner wall of the workpiece to generate impact force, so that the surface of the air leakage bag is opened, and leakage detection gas in the air leakage bag leaks. In one embodiment, the leaky bag may employ a frangible surface, such as thin glass; in one embodiment, the gas-leaking capsule can be removed from the inherent definition of "capsule" and simply "means for containing a source of leaking gas", and a plurality of open containers can be used to place chemical substances that can produce a chemical reaction, such as water and sodium metal, to produce a detectable gas, hydrogen.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (10)
1. A method of leak detection comprising the steps of:
step S1: filling the leak detection gas into the leak detection balloon;
step S2: placing the leakage air bag filled with leakage detection gas in a workpiece to be detected, and then sealing the workpiece to be detected;
step S3: placing a workpiece to be detected in the leak detection box;
step S4: leaking the leak detection gas in the leak air bag;
step S5: and detecting the leakage detection gas in the leakage detection box.
2. Leak detection method according to claim 1, characterized in that:
in step S3, after the placement of the workpiece to be tested is completed, the interior of the leak detection box is evacuated.
3. Leak detection method according to claim 1, characterized in that:
the leak detection gas is halogen gas, helium gas or hydrogen gas.
4. Leak detection method according to claim 1, characterized in that:
in step S5, the concentration of the leak detection gas in the leak detection box is detected in real time, so as to obtain a real-time concentration variation curve of the leak detection gas in the leak detection box within a preset time period.
5. Leak detection method according to claim 1, characterized in that:
in step S5, the air pressure of the leak detection box is detected in real time, and a real-time air pressure variation curve of the leak detection box within a preset time period is obtained.
6. Leak detection method according to any one of claims 1 to 5, characterized in that:
in step S4, the leaky bag is heated by a heating device, an opening is created on the surface of the leaky bag, and the leak detection gas inside the leaky bag leaks out.
7. Leak detection method according to any one of claims 1 to 5, characterized in that:
in step S4, the leak detection gas inside the leak airbag is leaked out by piercing the leak airbag by a piercing device.
8. Leak detection method according to any one of claims 1 to 5, characterized in that:
in step S4, the leak detection balloon leaks the leak detection gas inside thereof after a preset time period.
9. Leak detection method according to any one of claims 1 to 5, characterized in that:
in step S4, the air leakage bag is opened by an external force generated by shaking of the workpiece, so that the air leakage detection gas inside the air leakage bag leaks out.
10. Leak detection method according to any one of claims 1 to 5, characterized in that:
in step S4, the air-leaking bag is opened by a change in external pressure, so that the leak-detecting gas inside the air-leaking bag leaks out.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112747868A (en) * | 2021-01-26 | 2021-05-04 | 湖南弘毅科技有限公司 | Air tightness detection method |
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| CN201697768U (en) * | 2010-07-06 | 2011-01-05 | 重庆理工大学 | Inflatable air bag type sealed container leakage detector |
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| CN112747868A (en) * | 2021-01-26 | 2021-05-04 | 湖南弘毅科技有限公司 | Air tightness detection method |
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